Mr. Tiwari,
It is a part of Details of Expenditure of Form E.R.-4. It is applicalbe to only those units which have both goods i.e Dutyable and exempted. Those particular unit has to maintain a separte record for Total value on inputs including packing materials used for manufacturing on which cenvat credit not availed.
It will be availble there you need not to calculate separately,
Thanks,
S. Banerjee